CN102884737A - Method and arrangement for stabilizing a colour coding method for optical transmission of data - Google Patents
Method and arrangement for stabilizing a colour coding method for optical transmission of data Download PDFInfo
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- CN102884737A CN102884737A CN2011800243972A CN201180024397A CN102884737A CN 102884737 A CN102884737 A CN 102884737A CN 2011800243972 A CN2011800243972 A CN 2011800243972A CN 201180024397 A CN201180024397 A CN 201180024397A CN 102884737 A CN102884737 A CN 102884737A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
Abstract
The invention relates to a method for optically transmitting data between a transmitter and a receiver, in which a colour coding method based on a plurality of elemental colours is provided for the coding and transmission of the data, which colour coding method involves a respective elemental colour being sent by a respective transmitter-end optical radiation source and being received at the receiver end by a respective optical radiation receiver. The method provides for a control loop to be formed between the transmitter and the receiver, wherein the transmitter sends calibration messages to the receiver, and wherein a piece of compensation information is ascertained by comparing at least one channel property of at least one received calibration message with a corresponding channel property of at least one previously sent calibration message, and wherein the transmitter takes the compensation information as a basis for adjusting at least one transmission parameter.
Description
Technical field
The present invention relates to for the method and apparatus that the coloud coding method is carried out when the optical data transmission stabilisation.
Background technology
(" visible light communication (Visible-Light Communications) ", VLC), it for example can be used in the replenishing of conventional radiotechnics from the transfer of data by means of visible light known in the state of the art.At this, for example can be via light-emitting diode (LED) the transmission of data.At this, the data flow that for example will transmit with the form transmission of the modulation that can not perceive for the people.
In addition, known a kind of newer coding method for visible light, this coding method is based on the coloud coding of utilizing basic colors.In professional domain also at concept CSK(" gamut keying (Color Shift Keying) ") lower to this method.Other older addresses for this coding method are CCM(" colour coding modulation (Color Code Modulation) ") or CMC(" color multiplexing and encoding (Color Multiplex Coding) ").
The principle of work and power of VLC is said roughly and is under this coloud coding method of application, use the illumination that is mixed by a plurality of basic colors to come additionally the transmission of data, wherein corresponding basic colors is modulated to rapidly so that generally recognize continuous secondary colour for human eye.Usually use red, green and blue three basic color, these basic colors can send by corresponding light-emitting diode in the mode that takes into full account technically for this reason.
The detailed amending advice that is described in standard IEEE P802.15.7 of CSK, the people such as Yokoi: " Modified Text clause 6.9.2.2 ", on January 17th, 2010, find in the document sign " 15-10-0036-00-0007 ".Be VLC for one of application of CSK suggestion, also namely utilize the free-space communication of light.
In described amending advice, described at receiver side the variation at the optical power of the basic colors light-emitting diode of sender side setting has been compensated.According to this amending advice, based on the compensation of receiver side only compensation to the radiation of sending at sender side is not set.
Be used for being that by the applicant international patent application with application number PCT/EP2010/066907 and title " Verfahren und Anordnung zur Stabilisierung eines Farbkodierungsverfahrens bei einer optischen ü bertragung von Daten " of submitting on November 5th, 2010 is proposed in the method for sender side compensation.In described method, stipulate, will calibrate message by transmitter and send to receiver.In receiver, compare to determine compensated information by the characteristic of channel that will from the calibration information that receives, derive and the characteristic of channel of before in receiver, storing.This compensated information is sent to transmitter, carries out the coupling that at least one sends parameter based on determined compensated information in described transmitter.
Although the method for advising can realize optical power in the compensation of sender side, yet has following shortcoming: need to be with a large amount of changes of the control message of agreement exchange for its enforcement.For example, need additional control message to transmit compensated information, this compensated information is not set up in agreement so far.Another shortcoming of the method for advising is, memory channel characteristic and in receiver, calculate compensated information based on the characteristic of channel of storing, and this resource to receiver proposes additional requirement.
Summary of the invention
Task of the present invention is, is given for the device of the spectrum of the optical radiation that sends in the compensation of emission pusher side, and it is to proposing less requirement for implementing the needed change of compensation arrangement.
The optical transmission system of the method for the feature of solution of the present invention by having claim 1 and the feature by having claim 9 carries out.
The present invention stipulates a kind of for when the method for coloud coding being carried out during the transmission of data optically stabilisation between transmitter and receiver, wherein for data being encoded and transmitting the coloud coding method that arranges based on a plurality of basic colors, wherein corresponding basic colors sends and is received by corresponding optical radiation receiver at receiver side by the optical radiation source of at least one corresponding sender side.
The calibration message that is made of transmitter comprises at least one time series, utilizes the value of the optical power that will send to adjust the optical radiation source that at least one distributes to basic colors in described time series.Therefore in other words, control as the corresponding set radiation source of basic colors in the mode of definition by this calibration message, so that can then determine in the optical power that is sent by corresponding radiation source and the relation between the optical power of corresponding radiation receiver place reception.Calibration message is received at the receiver place; The corresponding value of the optical power that then, receives in corresponding optical radiation receiver place is determined.The corresponding value of the optical power that receives in corresponding optical radiation receiver place is transmitted to transmitter subsequently.
According to the present invention, the corresponding value that makes the optical power that receives in corresponding optical radiation receiver place in transmitter produces relation with the corresponding value of the optical power that sends in corresponding place, optical radiation source.Based on this relation, determine compensated information, wherein at sender side at least one is sent parameter based on this compensated information and mate.
Can be understood to below concept " transmitter " and " receiver ", " transmitter " except it not only sends the characteristic of data but also receive data in duplex operation simultaneously as light source, and " receiver " unnecessaryly moved as light source although can transmit and receive data in duplex operation.Transmitter comprises as space illumination or also as the illustrative embodiments of display panel as light source operation.
Concept " corresponding optical radiation receiver " comprises one or more radiation receivers by concrete condition, and described radiation receiver is arranged for and receives one or more basic colors.Corresponding situation is applicable to corresponding optical radiation source.
The present invention can realize the compensation of sender side of the secondary colour of the optical radiation that sends in an advantageous manner, and described secondary colour is for example owing to change has occured the intensity drift of each basic colors.
Significant advantage of the present invention can be, can only carry out slight change aspect the agreement in use device situation of the present invention.When the protocol processes of receiver side, only stipulate, be defined as optical power that corresponding basic colors arranges and by the corresponding value of backward channel to transmitter transmission optics power.Determining not of at first mentioning need to be after all for receiving and being the change aspect the set flow process of the value of determining optical power.Next reverse transfer to the corresponding value of optical power of mentioning advantageously is confined to " relaying (Relaying) " method, and in the situation of this " relaying " method, the returning merely to expend with a small amount of agreement of the value that receives is associated.Especially advantageously, make receiver and broken away from by measure well known in the prior art, described measure need to be kept data and from that keep and current measured compensation data calculation information.This enforcement and calculating expend and are transferred to now on the transmitter, and this is favourable aspect following, because after all be distributed in center role in the compensation to transmitter.
The theme that favourable expansion scheme of the present invention and improvement project are dependent claims.
Favourable expansion scheme relates to the associating between transmitter and receiver.The present invention and expansion scheme of the present invention cause the bandwidth efficiency with respect to the improvement of hitherto known method of the calibration message that sent by transmitter and receiver.The bandwidth efficiency of this improvement can owing to: during uniting, only must exchange once configuration messages, and only have as so-called calibration message or " observability frame (Visibility Frame) " when being sent by transmitter, just then determine the optical power that receives at corresponding optical radiation receiver place.For example can not transmit when other when current, send the observability frame.Therefore do not compete with data communication service in principle according to colour stability of the present invention, this situation when aforesaid method is like this.
Description of drawings
Embodiment with other advantages of the present invention and expansion scheme is set forth below with reference to the accompanying drawings in more detail.
This:
Fig. 1 illustrates be used to the structure chart that schematically shows optical transmission system;
Fig. 2 illustrates be used to the structure chart that schematically shows regulating loop of the present invention;
Fig. 3 is to have the two-dimentional CIE standard colour chart by the color assignment of 4 some definition first illustrate;
Fig. 4 is to have the two-dimentional CIE standard colour chart by the color assignment of 4 some definition second illustrate;
Fig. 5 illustrates the two-dimentional CIE standard colour chart that has by the color assignment of 8 some definition;
Fig. 6 illustrates the two-dimentional CIE standard colour chart that has by the color assignment of 16 some definition;
Fig. 7 illustrates the AC current characteristics of the optical radiation power of the radiation source relevant with the drive current of carrying;
Fig. 8 illustrates the direct current characteristic of the optical radiation power of the radiation source relevant with the drive current of carrying;
Fig. 9 illustrates the structure chart that is used for schematically showing optical transmission system according to enforcement flexible program of the present invention;
Figure 10 illustrates be used to the seasonal effect in time series structure chart that is illustrated in the symbol in the example calibration message; With
The optical delivery that Figure 11 illustrates based on data represents the seasonal effect in time series structure chart of the message that exchanges when network node and telegon associating.
Embodiment
Fig. 1 illustrate for visible light based on CSK(" gamut keying ") Optical Data Transmission System, VLC system (" visible light communication ") for example.
Data transmission system is comprised of transmitter TX, span line TRM and receiver RX basically.Transmission system is worked in the duplex operation mode, and wherein transmitter TX not only can send data but also can receive data.Corresponding situation is applicable to receiver RX.
The CSK method is based on the coloud coding with for example red, green and blue a plurality of basic colors.The detailed amending advice that is described in standard IEEE P802.15.7 of CSK, the people such as Yokoi: " Modified Text clause 6.9.2.2 ", on January 17th, 2010, find in the document sign " 15-10-0036-00-0007 ".
In Fig. 1, only illustrate for sending needed functional unit and illustrating for receiving needed functional unit in receiver RX side in transmitter TX side for oversimplifying reason.
Consider the transfer function of CSK system according to Fig. 1.With general literary style, below A representing matrix and a represent column vector.
At sender side TX, at first numerical data DAT is flowed to chromacoder CC.Data DAT is converted into the XY value according to mapping ruler in chromacoder.These XY values are corresponding to the value in the XY color coordinates according to the Fig. 3 that will describe after a while is.
Output at chromacoder CC, these 2-D datas (symbolically representing by two arrows in the figure) are fed to converter TR, at the output of described converter three digital signal strength values of signal are offered respectively one of three basic color.For three digital signal strength values of corresponding basic colors index i, j, k with the signal strength signal intensity vector description:
Common index Tx here with the parameter of following representative sender side.The binary value of the corresponding signal strength values of superscript (b) representative.
Corresponding digital signal strength value is fed to transducer DA, converts the digital signal strength value to the analog signal parameter in described transducer.Three analog signal parameters are as describing with the current strength vector for the corresponding current parameter of corresponding basic colors index i, j, k:
Optical radiation source Ti, Tj, Tk under these analog signal parameters are fed to respectively also are the first optical radiation source Ti, the second optical radiation source Tj and the 3rd optical radiation source Tk.
According to a preferred embodiment of the invention, the first optical radiation source Ti is corresponding to red light emitting diodes, the second optical radiation source Tj corresponding to green LED and the 3rd optical radiation source Tk corresponding to blue LED.
The optical radiation that is so sent by corresponding radiation source Ti, Tj, Tk is directed in the direction of receiver RX by span line TRM.
The optical power component that is sent by corresponding radiation source Ti, Tj, Tk is described with the approach vector of the optical power that sent:
In receiver RX side, the optical radiation that sends is mapped to radiation receiver Ri, Rj, the Rk that is adjusted to corresponding basic colors, also is the first optical radiation receiver Ri, the second optical radiation receiver Rj and the 3rd optical radiation receiver Rk.
The optical power component that arrives corresponding radiation receiver Ri, Rj, Rk is described with the approach vector of the optical power that received:
Common index Rx here with the parameter of following representative receiver side.
Mode with similar, opposite with transmitter TX converts corresponding optical signalling to analog signal by optical radiation receiver Ri, Rj, Rk in receiver RX.Three analog signal parameters are as describing in the mode of current strength vector for the corresponding current parameter of corresponding basic colors index i, j, k:
Analog electrical signal is fed to corresponding transducer DA, carries out corresponding analog signal parameter to the corresponding conversion of corresponding digital signal strength value in described transducer.Three signal strength values for corresponding basic colors index i, j, k are described in the mode of signal strength signal intensity vector:
Digital signal strength value three corresponding transducer DA place interceptings is fed to converter TR, described converter will be worth the tlv triple value of changing into two tuples in the mode opposite with transmitter TX, this is worth two tuples and is fed to again colour decoder CD, output at described colour decoder extracts data DAT at last, and described data are identical with the data DAT that flows to transmitter TX under correct operational mode.
The below illustrates the compute associations of each parameter.
According to
The optical power that passes through to send and the multiplication of transmissivity matrix T are described in related between the optical power that receives and send.The transmissivity matrix T is described from corresponding basic colors radiation source Ti, Tj, Tk to being other respectively basic colors set radiation receiver Ri, Rj, the optical transmittance of Rk.The coefficient of transmissivity matrix T is following to be expressed:
In other words, the transmissivity matrix T is described the propagation characteristic of light, the 3rd radiation receiver Rk that for example by how many arrival in the red light of the first optical radiation source Ti transmission is arranged for blue light.Coefficient is passed through in this association
Determine.
Another association can be described between by the current strength of radiation receiver Ri, Rj, Rk output and the optical power that receives:
The optical power that this equation passes through to receive and the multiplication of sensitivity matrix E are described in related by between the current strength of radiation receiver Ri, Rj, Rk output and the optical power that receives.Sensitivity matrix E is described in radiation receiver Ri, Rj, the Rk(light inductance receiver that color is selected when receiving one of basic colors) one of sensitivity.
Typically, still non-mandatorily, use with the basic colors light-emitting diode, also be optical radiation source Ti, Tj, Tk just the same many radiation receiver Ri, Rj, Rk.Index i is being distributed to " redness ", j is being distributed to " green " and k is distributed in " blueness " situation the element of matrix E
For example be in the sensitivity that receives the light time red light electro receptor that is sent by red LED.Therefore sensitivity matrix E considers the spectrum efficiency in response to corresponding radiation receiver Ri, Rj, the Rk of basic colors and the colour filter that additionally may arrange, and carry out correspondingly linear combination by the coefficient to sensitivity matrix E, consider in response to radiation receiver Ri, the Rj of corresponding basic colors, " the crosstalking " between the Rk.The coefficient of sensitivity matrix E is following to be expressed:
Another association can be described between corresponding digital signal strength value (overview ground is with the form of signal strength signal intensity vector) and the signal strength signal intensity of being exported respectively by radiation receiver Ri, Rj, Rk:
Operand
Be in the value of passing through the analog-digital converter transformation of the independent variable in the brace here with following expression.
The transition matrix B of receiver side is diagonal matrix and is described in conversion factor between the analog-and digital-receiver signal.
At last can with also be based upon related between the current strength that flows to respectively corresponding radiation source Ti, Tj, Tk and the corresponding digital signal strength value form of signal strength signal intensity vector (briefly with) in transmitter TX side like the above-mentioned association class:
Operand
Be in the value of passing through the digital analog converter transformation of the independent variable in the brace here with following expression.
The transition matrix A of sender side is diagonal matrix equally and is described in related between corresponding digital signal strength value and the driving alternating current that flows to respectively corresponding radiation source Ti, Tj, Tk.The coefficient of the transition matrix A of sender side is such as the expression of getting off:
Following equation is based upon the relation between signal strength signal intensity vector receiver side and sender side:
If the quantum efficiency of optical radiation source Ti, one of Tj, Tk---in other words, the drive current of carrying respectively and the ratio of optical power (Verh ltnis)---along with the time changes, then outcome function f changes over modified function f thereupon '.Thereby, under identical transmitter RST, thus the signal that receives change and vectorial according to the signal strength signal intensity of aforesaid equation receiver side
Also change.If its value is available in transmitter TX side, then can basis
Derive and concern.The signal strength signal intensity vector
Corresponding to modified signal strength signal intensity vector at receiver side, wherein with respect to the signal strength signal intensity vector
The signal strength signal intensity vector of modified receiver side
Above-mentioned change based on the quantum efficiency aspect draws.
In the above-mentioned relation situation, sufficiently high position based on the hypothesis in the binary representation of the parameter of setting up in equation is long, suppose that its corresponding binary value of described parameter is identical, no longer exist so that represent in the superincumbent relation of superscript (b) of binary value.
In addition, based on the sufficiently high quantisation depth of the hypothesis of the digital analog converter of the analog-digital converter of receiver side and sender side, also with operand
With
From top equation, eliminate.In other words, suppose that the value through changing is identical with the value that will change.
The Change Example of quantum efficiency aspect as by variations in temperature or since the ageing process that sends in the radiation source draw.The change of quantum efficiency means for corresponding optical radiation source Ti, Tj, Tk, and more or less optical power is issued under identical current conditions.
Utilize device of the present invention, in order to be implemented in sender side to compensating in the variation aspect the optical power of each basic colors radiation source to coloud coding method stabilisation.The signal strength signal intensity vector that for this reason at first sends with penalty function c conversion, so that draw lower relation of plane:
Aforesaid equation can be introduced into the form that shortens:
Above-mentioned relation has proposed the inverse problem of a complexity, has at least two kinds of actual conditions for this relation, and for these actual conditions, this relation can solve with (geschlossen) form of sealing.
What be suitable in both cases is
Wherein
Be diagonal matrix, it is also referred to as compensation matrix below
For the first situation, in this first situation, only changed according to the driving alternating current of carrying according to the characteristic size at the function of the optical radiation power of the radiation source shown in Fig. 7, but its curve form (shape) is not changed, and can be with the eigen vector function representation:
Wherein
Be diagonal matrix, it can be understood to general quantum efficiency matrix, and described general quantum efficiency matrix shines upon the change of the quantum efficiency aspect of corresponding radiation source Ti, Tj, Tk.Therewith differently, vector function thus defined
Irrelevant with the quantum efficiency of corresponding radiation source Ti, Tj, Tk.Compensating factor for this situation can be determined according to lower relation of plane:
It should be noted, based on upper relation of plane at compensation matrix
In compensating factor determine based on a plurality of in the confirmable factor of sender side and based on the parameter of unique receiver side, also be the signal strength signal intensity vector of receiver side
The factor of other sender sides comprise sender side transition matrix A and with the irrelevant vector function of the quantum efficiency of corresponding radiation source Ti, Tj, Tk
In other words, knowing the signal strength signal intensity vector of the receiver side that sends from receiver to transmitter
Thereby situation under realize the compensation of radiation source of sender side and the stabilisation of coloud coding.
For the situation of the pure linearity of the second, for this situation,
Relevant with the i linearity, also namely:
Compensation matrix
Determine be reduced to:
It should be noted, based on upper relation of plane at compensation matrix
In the determining based in the confirmable factor of sender side of compensating factor
And based on the parameter of unique receiver side, also be the signal strength signal intensity vector of receiver side
In this second situation, also knowing the signal strength signal intensity vector of the receiver side that sends from receiver to transmitter
Thereby situation under realize the compensation of radiation source of sender side and the stabilisation of coloud coding.
In order to proofread and correct the transmission parameter, suggestion is according to the following method of Fig. 2 and 9.
Fig. 2 at first illustrates be used to the schematic diagram that schematically shows regulating loop of the present invention.At this, functional unit known from Fig. 1 is shown again, i.e. transmitter TX and receiver RX.
Transmitter TX consists of at least one calibration message CAL and should calibrate message and send receiver RX to.Calibration message CAL comprises at least one time series, and in described time series, the value of the optical power that utilization will send is adjusted at least one optical radiation source of distributing to basic colors.
Calibration message CAL is received in receiver RX.The corresponding value of the optical power that receives at corresponding optical radiation receiver place sends to transmitter TX by receiver RX transmission interface TI via receiver side in the scope of corresponding message by backward channel BC.There, message is received via the receiving interface RI of sender side.
In transmitter TX, make the corresponding value of the optical power that receives at corresponding optical radiation receiver place and the optical power that sends at place, corresponding optical radiation source produce relation.Then determine compensated information based on above-described relation, wherein carry out the coupling that at least one sends parameter based on this compensated information.
Fig. 9 especially illustrates the known functional unit from Fig. 1 of Optical Data Transmission System, wherein realizes by backward channel BC at the regulating loop shown in Fig. 2.
In transmitter TX side calibration message generator TSG is set, by described calibration message generator digital calibration message is applied on the input of corresponding transducer DA of corresponding optical radiation source Ti, Tj, Tk.That then change and correspondingly decoded at receiver side Rx via the calibration message of optical radiation source Ti, Tj, Tk transmission.In analytic unit CU, the corresponding value of the optical power that receives at corresponding optical radiation receiver Ri, Rj, Rk place is determined.Then, the corresponding value in the corresponding message is sent to the color stabilization module CSM of transmitter TX via backward channel BC.
In color stabilization module CSM, the corresponding value that makes now the optical power that receives at corresponding optical radiation receiver Ri, Rj, Rk place concerns with the corresponding value generation of the optical power that sends at corresponding optical radiation source Ti, Tj, Tk place.Result as this relation determines compensated information, wherein carries out the coupling that at least one sends parameter based on this compensated information.For this reason, the intermediate circuit of the digital signal that then will send by corresponding correcting element Ci, Cj, Ck multiplies each other with corresponding compensated information, so that the secondary colour of the light that sends is with initial again consistent.For example, determine corresponding compensating factor for corresponding basic colors.
The two-dimentional standard colour chart of the definition according to the CIE of Commission Internationale De L'Eclairage shown in Figure 3.At this, with the three basic color, for example red, green, blueness is mapped on two coordinate x, the y.The 3rd basic colors is definite by concerning x+y+z=1 from two other basic colors on calculating for each point of colour chart.Thereby Fig. 3 illustrate by means of the converter TR shown in Fig. 1 with two-dimentional xy value convert (mapping) become the three dimensional signal data.
In the standard colour chart according to Fig. 3, color assignment or color map be used to 4 CSK methods that are also referred to as 4 CSK are shown.Corresponding 4-CSK transmission system can be for each symbol transmission two bits of transmitting.At this, define four color dot 00,01,10,11, the center of gravity of its excess-three color dot 00,10,11 of arranging in the summit of constellation (Konstellation) shown in the color dot 01 that wherein represents with cross is formed in.This center of gravity 01 often is also referred to as " center of gravity (Centre of Gravity) ".Remaining color dot 00,10,11 other three symbol of definition, described other three symbols sequentially correspond essentially to basic colors green, blueness and red with this.
Arrow shown in center of gravity 01 symbolically represents the drift of center of gravity 01, and this drift may cause based on the change owing to the non-linear of radiation source Ti, Tj, Tk or the quantum efficiency relevant with direct current of the direct current characteristic of employed light-emitting diode in radiation source Ti, Tj, Tk.
In color dot 00,10, the arrow of 11 places shown in respectively symbolically represents eccentric color dot 00,10,11 drift, this drift may cause based on the change owing to quantum efficiency linearity or relevant with alternating current of radiation source Ti, Tj, Tk of the AC current characteristics of employed light-emitting diode in radiation source Ti, Tj, Tk.
Because the corresponding position of color dot in color assignment and layout are used to encoding symbols and decoding in the mode of being set forth, so be also referred to as planisphere at the chart shown in Fig. 3.
In Fig. 4 be for 4 CSK methods that are also referred to as 4 CSK from the known planisphere of Fig. 3.This planisphere illustrates in the mode without Reference numeral, in order to can realize and the comparativity that has according to the planisphere of the symbol quantity of the high value of following Fig. 5 and 6.
This figure and below Fig. 5 and 6 in keep with the symbol of outermost shown in the point or the summit color assignment with high value.These summits of planisphere correspond essentially to basic colors green, blueness and red.
The planisphere of 8 CSK methods be used to being also referred to as 8 CSK shown in Figure 5, it allows 3 coding depth for each symbol.In this constellation, center of gravity or " center of gravity " are not comprised in the color coding.
The planisphere of 16 CSK methods be used to being also referred to as 16 CSK shown in Figure 6, it allows 4 coding depth for each symbol.In this coding depth of 4 of each symbols, center of gravity is comprised in the color coding as in the coding depth situation of 2 of each symbols of setting forth in the above.
That the calibration message that sends by the optical radiation source does not cause for human viewer in the change aspect light color and the luminous intensity about compensating color-coded prerequisite with inner space illumination being used for of using concurrently that optical data transmission will need.
Color assignment aspect shown in this superincumbent Fig. 4 to Fig. 6 means that the center of gravity of each sequence of the symbol that sends must be consistent with the center of gravity of corresponding planisphere in one or more calibration message.This consistency or pass to lower mode and realize, its mode be, only sends a symbol, and the color dot of this symbol is consistent with the center of gravity of planisphere.
Alternately, the sequence of altered symbol is set, its average geometric center of gravity is consistent with the center of gravity of planisphere.The second flexible program of mentioning at last has advantage: it also is applicable to the 8-CSK color assignment according to Fig. 5, and wherein the center of gravity of constellation is not included in the color coding.
Therefore advise in one embodiment of the invention that the sequence of altered symbol is set, and these symbols experience the summit of corresponding planisphere circularly in one or more calibration message.When using three basic color blue, green, redness, this means that described color is experienced with corresponding symbolic coding ground with the order of circulation.
For the situation that should only realize color-coded stabilisation about the alternating current feature of radiation source by corresponding recalibration, enough is, send one or several calibration message, by a series of symbols in succession of described calibration transmission of messages, wherein each symbol corresponding to corresponding basic colors only is sent out once or also repeats with a small amount of number of times only.
And if the hot dynamic of the low frequency that should determine corresponding optical emitter, in other words, the direct current characteristic, then only the transmission of one or several symbol is too short, so that can not realize the heat balance that needs for this reason.
Thereby the hot dynamic of described low frequency of radiation source affects on the one hand the quiescent current stabilisation and affects the position of the center of gravity in the planisphere, also affects on the other hand the noticeable average color in the optical power of the emission of radiation source.
The typical thermal response time of the light-emitting diode that exemplarily uses in radiation source is in the delicate scope, and this micrometer range surpasses the duration that is less than in 100 nano-seconds that is in of symbol widely.
Therefore, suggestion repeats each symbol so continually before describing Figure 10 according to the embodiment of the present invention, until realize heat balance in corresponding radiation source till, so that be to switch to next symbol.
Intensity vector
So be important for the symbol of the repetition of the last transmission in this sequence only at signal that receiver side receives send by the corresponding optical radiation source that is in the heat balance because only be in the symbol of ending place.Alternately, the symbol that is in right quantity at the end of sequence consists of mean value.
Before the symbol that switches in a looping fashion corresponding to next summit in the planisphere, for typical light-emitting diode and for the typical transmission rate by means of the present known data transmission method of visible light, repeat for about 100 times that measure each symbol.
Receiver RX at this with the intensity vector that receives
The analog value of the optical power that receives in corresponding optical radiation receiver place of form sends it back to transmitter.Alternately, have specific to the intensity vector of the corresponding mean value on all three summits of planisphere and be sent back to.
Be noted that herein the use to the CSK modulation that is used for color stabilization of advising only is one of many possible embodiment here.Another example is to use so-called on-off keying modulation (On-Off-Keying-Modulation).In the case, for example so control all three light sources during the stage " opening (On) ", so that the secondary colour of the light that sends is corresponding to the secondary colour of the color center of gravity of the CSK symbol that sends during data communication service.
" close (Off) " so for example there is not anything to be sent out during the stage.Symbol " is opened " in only radiation in favourable enforcement of the present invention, that is to say, light source remains constantly during sending symbol and opening.
Can consider also that when selecting the symbol repetition rate time that human eye perceives as flicker is short for being compared to the needed total time of all summits of experiencing circularly planisphere.If for example 5 milliseconds maximum permission cycle is set to the flashless limit that perceives, then allow each the symbol sebolic addressing in three summits to be 1.66 milliseconds to the maximum.
Because with second, minute or even hour the variation that draws the quantum efficiency aspect of radiation source of long period yardstick, so the corresponding intensity vector of the optical power that not necessarily need to will receive at corresponding optical radiation receiver place according to each symbol sebolic addressing sends back to transmitter.Instead, timer can be set in receiver, described timer determines how to send continually described intensity vector.
Fig. 7 illustrates the function of the optical radiation power P of the light-emitting diode of distributing to corresponding radiation source Ti, Tj, Tk according to the driving alternating current IAC that carries.This function is also referred to as the quantum efficiency relevant with alternating current of light-emitting diode.The AC current characteristics of quantum efficiency is linearity or almost linear according to Fig. 7.
At the solid line shown in Fig. 7 at this corresponding to initial quantum efficiency QE1, this initial quantum efficiency changes in the running of radiation source, for example reduces here, this is by being positioned at being shown in dotted line of below according to the quantum efficiency QE2 that changes.
The quantum efficiency QE2 of this change causes, for the driving alternating current i that provides, initial optical power
Drop to less value
Thereby for the optical power that again obtains in compensation and in to the scope of the stabilisation of coloud coding to send
Initial value, must change over higher value i' with driving alternating current.
The function of quantum efficiency of light emitting dio is shown according to the drive current IDC that carries in Fig. 8.This quantum efficiency illustrates according to the direct current characteristic about drive current IDC at this.Direct current characteristic Fig. 8 of quantum efficiency is nonlinear.This nonlinear reason is various character and for example causes by the possible saturation effect in thermal inertia and/or the light-emitting diode.
According to preferred implementation of the present invention, be used to the compensating non-linear quantum efficiency according to the present invention by means of compensating the stabilisation of transmission parameter to coloud coding.In an identical manner, utilize device of the present invention also can carry out compensation about linear quantum efficiency, and this is not arranged the measure of special change.
Figure 10 illustrates symbol i, the j with repetition, a series of calibration message of seasonal effect in time series or the example calibration message of k.According to one embodiment of the present invention, utilize these calibration message to send at least one sequence, in described sequence, utilize the value adjustment of the optical power that will send to distribute in the optical radiation source of basic colors at least one.
Each symbol i of corresponding sequence, j, k this for example corresponding to planisphere in above the summit.By in sequence, seamlessly mutually arrange in a large number, for example hundreds of to thousands of symbol i, j, k that have respectively less than the repetition of duration of 1 μ s, realize the in time full illumination of length in optical radiation source at this, thereby by this full illumination thermally equilibrated foundation of realization with for the center of gravity of planisphere is carried out stabilisation.In the drawings, at this first and last symbol i, j, k of corresponding frequencies only are shown respectively, the abridged symbol is by the symbolic expression of corresponding point.After hundreds of sequences to thousands of symbol i of first basic colors corresponding with the first summit in the planisphere, follow the hundreds of sequences to thousands of symbol j corresponding to second basic colors on the second summit in the planisphere.Then follow the hundreds of sequences to thousands of symbol k corresponding to the 3rd basic colors on the 3rd summit in the planisphere, so that be again to continue with hundreds of sequences to thousands of symbol i of the first basic colors.
According to one embodiment of the present invention, especially use so-called " observability frame " for this calibration message.According to the standard 802.15.7 that still is in the formation, can be by optical radiation source utilizing emitted light, described optical radiation source itself needn't be used to transfer of data.This follows purpose: the function of implementing to be not used at first transfer of data.This function for example comprises the noticeable signalling of optics to warning.
For these functions, grouping or frame (" Frame ") are set, although it comprises MAC data head entry or " head (Header) ", in the useful data part (" payload (Payload) ") of frame, be not included as the set original data of transmission.Useful data Partial Replacement ground comprises the data that produce visual information, and described visual information is change color or for example use the flashing light of signal indication communications status or Trouble Report for example.Described frame is also referred to as " color observability light modulation frame (Color Visibility Dimming Frame) " or CVD frame.The CVD frame also can be sent out for the space illumination that keeps tunable optical with inactivity pattern (standby).
According to the again consideration to Fig. 9, set forth now determining of compensated information.
In order to determine compensated information in transmitter TX side, need the intensity vector of receiver side
As the reference signal.For this reason, with one or more intensity vector that receive at receiver side
The analog value of the optical power that receives at corresponding optical radiation receiver place of form sends transmitter TX to via optics backward channel BC.
The intensity vector of receiver side at receiver side as the reference intensity vector
Be stored.For in succession measuring the time of indicating for respectively of the signal strength signal intensity that receives of immovable calibration message
Cause the intensity vector relevant with the time
If intensity vector
In component and referenced strength vector
Corresponding component have significant difference, the signal that then will send for optical data transmission is being used compensation matrix in corresponding correcting element Ci, Cj, Ck
Diagonal element proofread and correct, especially multiply each other.
Can be based on compensation matrix
The value of the diagonal element of itself is made the decision that when needs this correction.If these diagonal elements are different from value 1 significantly, then need the correction to present compensating factor.Can or determine when should be significant with deviation evaluation according to codomain given in advance (for example 5% deviation), perhaps can based on data triggering decision itself.Example to this is the using compensation matrix
The histogram of diagonal element.At this, marked difference can be rated as and surpass predefined confidential interval, for example 95% confidential interval.
Saturated or the light-emitting diode of analog-digital converter or digital analog converter saturated or damage on the aspect in place can be introduced intensity vector
Three values with and the value of proofreading and correct
The priori maximum horizontal.
Relate in an identical manner the variation of all basic colors, for example variation of the length of optical transmission segment TRM can be by comparing compensation matrix
All diagonal elements usually identify.If this matrix
The identical relative variation of important experience, then do not need the compensation.
For except matrix
Diagonal element outside significantly different with value zero situations, can suppose obstruction to span line for being different from the reason of setting forth so far thus.The example of this obstruction is with respect to the only optical radiation source of blocking-up of crosstalking.This exemplarily means, although optical radiation receiver Ri receives the optical radiation that is sent by radiation source Ti, does not receive the optical radiation that is sent by all the other radiation source Tj, Tk.In this case, related optical radiation source Tj, the drive current of Tk are not compensated.Instead, for example this information can be used for passing through the warning report that transmitter TX generates.Another option is to use modified referenced strength vector
With this modified referenced strength vector of other use
Be used for other compensation.
The below sets forth general network node to distribution or the associating of telegon according to Figure 11.In such message situation, set forth modified message structure based on embodiments of the invention.
That represent as transmitter TX in the aforementioned embodiment and should describe owing to generality with the conversion of the term aspect of following functional unit as telegon description as much as possible, wherein telegon comprises at least one transmitter TX.This is applicable to comprise the network node of at least one receiver RX in a similar fashion.
Figure 11 illustrates the message sequence of the mentioned distribution of the network node (being also referred to as equipment or the network equipment) with telegon.The functional unit of telegon is arranged in right one side of something of figure at this.These functional units comprise that the assembly CM(of the MAC layer side of telegon is also known as " telegon MLME " in professional domain) and at the higher level CH of the telegon shown in the edge of the rightmost side.The higher level CH of telegon is also referred to as " next higher level of telegon (Coordinator Next Higher Layer) " in professional domain.
Two layers of network node correspondingly are shown, at length for the MAC layer DM of the network node that in professional domain, is also referred to as " equipment MLME " and at the higher level DH of the network node at leftmost edge place in the left side of Figure 11.The higher level DH of network node is also referred to as " next higher level of equipment (Device Next Higher Layer) " in professional domain.
In case network node adds the network by coordinator management, then this network node transmits its technical capability that is used for the color stabilization that connects at CSK or " Capabilities(ability) ".The below's hypothesis, at least one connection are constructed to CSK and connect.In opposite situation, generally in network, do not need the color stabilization function.
Do not limiting in the general situation, the below hypothesis only asks a network node to send current data about color stabilization.Then network node and telegon are carried out in the message shown in Figure 11.
Message according to Figure 11 illustrates in the situation that the MAC layer CM of the MAC of network node layer DM and telegon participates in.It is to be noted that the message of the message that the below illustrates occurs at physics " PHY " layer strictly in the situation that MAC layer DM, CM participate in.For the purpose of simpler layer expression, abandon the expression to physics " PHY " layer.
When this flow process begins, sent to the MAC layer DM of network node by the higher level DH of network node and to distribute request 10.This distribution request 10 according to the agreement that still is in the standard 802.15.7 in the formation also use " the MLME-ASSOCIATE.request(MLME-associating. request) " expression.
Distribute request 10 by sending, network node request distribution and utilization distribute request 10 to send it for technical capability or " Capabilities " at receiver side execution CSK color stabilization.
According to the acquisition that distributes request 10, the MAC layer DM of network node will distribute request 12 to send to the MAC layer CM of telegon.Distribute request 12 also to use " Association request(joint-request) " expression according to agreement.
The MAC layer CM of telegon is with confirming that 14 confirm to distribute request 12.Confirm that 14 also use " Acknowledgment(admits) " expression according to agreement.Below, partly statement ground does not suppose that request message is replied by the other side's affirmation message in principle.
Receive distribute request 10,12 after, by the MAC layer CM of telegon to the higher level CH of telegon send according to agreement also use " the MLME-ASSOCIATE.indication(MLME-associating. indication) " the distribution inquiry 20 of expression.There, make the decision of whether and where calling color stabilization.Be the situation that duplexing CSK connects for the connection that will set up, the color stabilization of network enabled node can be decided in its sole discretion for telegon.As already mentioned, in this description, only set forth ordinary circumstance, wherein carry out color stabilization by telegon.Every other possible situation can utilize corresponding professional's knowledge to derive from the special description of this applicable cases.
Whether make should with should where call the decision of color stabilization after, sent to distribute to the MAC layer CM of telegon by the higher level CH of telegon and reply 30, wherein the mode that will describe in addition of corresponding field " response of Capability-Negotiation-Response(capability negotiation) " basis is occupied.Also use according to reaching an agreement on " the MLME-ASSOCIATE.response(MLME-associating. response) " represent to distribute and reply 30.
Information in this " response of Capability-Negotiation-Response(capability negotiation) " field is converted to corresponding MAC message 36,38 by the MAC layer CM of telegon and the MAC layer DM of network node subsequently, and described MAC message is set forth below.Same message 32, the 34th shown in the figure, for the placeholder (Platzhalter) of other message, described placeholder in interlude, be performed and for shown in to unite be inessential, therefore further be not described here.
The MAC layer CM of telegon replys 36 to the MAC layer DM transmission distribution of network node, and the MAC layer DM that described distribution is replied by network node confirms with affirmation 38.Distribute and to reply 36 and also use " Association response(unites response) " expression according to agreement, confirm 38 also to use " Acknowledgement(admits) " represent.MAC layer DM basis within the adjustable time interval by network node is replied 36 distribution that show by confirming the 14 distribution requests of confirming, 12 expectations by distribution, and the described time interval is monitored by timer.This time interval is also referred to as " mac-ResponseWaitTime (mac-response wait time) " and illustrates by two triangles that are adjacent to each other with its tip in the drawings.
After having transmitted mentioned message 36 and 38 fully, the higher level DM of network node will distribute affirmation 40 to send to the higher level DH of network node to be used for further carrying out the color stabilization method.Distribute to confirm 40 according to agreement also use " the MLME-ASSOCIATE.confirm(MLME-associating. confirm) " expression.
Show that by means of state 50 higher level CH from from the MAC layer CM of telegon to telegon report this distribution in an identical manner.State demonstration 50 is also used " MLME-COMM-STATUS.indication " expression according to agreement.
Finishing after this distributes, telegon sends calibration message and from network node picked up signal intensity vector with the form of " observability frame " to network node now
The analog value of the optical power that receives at corresponding optical radiation receiver place of form.
For associated units with the situation of engineering feasibility that be used for to consult color compensating under implementing the method according to this invention aspect the agreement of the control message that is exchanged, according to the modification of the agreement advice message structure that still is in the standard 802.15.7 in the formation.What emphasize again is herein, only is transmitted in the value of the optical power that corresponding optical radiation receiver place receives and abandons further solution according to the present invention in receiver side preparation value in the only small change of needs aspect the agreement.
Distribute the semanteme of request 10 to illustrate below:
According to one embodiment of the present invention, in distributing request 10, carry out the modification of parameter " CapabilityInformation(ability information) ", below being modified in, this is further set forth.Parameter " CapabilityInformation " is specified the technical capability of the network element distribute or " Capabilities " and is had data type " Bitmap(bitmap) ", and this data type also can adopt the data with variable-length and content.
Distribute and show that 20 semanteme illustrates below:
According to one embodiment of the present invention, also in distributing demonstration 20, carry out the modification of parameter " CapabilityInformation ", below being modified in, this is further set forth.
Distribute and to reply 30 semanteme and illustrate below:
According to one embodiment of the present invention, reply the definition of carrying out new argument " response of CapabilityNegotiationResponse(capability negotiation) " in 30 in distribution, below being defined in, this is further set forth.Parameter " CapabilityNegotiationResponse " is specified telegon replying the distribution request of network element.
Distribute and confirm that 40 semanteme illustrates below:
, further set forth below this is defined in also distributing the definition of confirming to carry out in 40 new argument " CapabilityNegotiationResponse " according to one embodiment of the present invention.
Below, the modification of setting forth parameter " CapabilityInformation ".Affiliated " capability information element (Capability Information Element) " has following structure:
| Capability information field (Capability Information Field) | … |
In the superincumbent tabulation and below ellipsis " ... " expression, corresponding the enforcement for corresponding embodiment does not have implication.
Capability information element is comprised of a plurality of fields, only considers capability information field below wherein.Capability information field is in the general technology ability of this record network node, and it is exemplarily shown in below the form:
| Layer | The position | Function |
| … | … | … |
| PHY layer ability | 26 | PHY(CSK alternately) supports |
| … | … | … |
Carry out the parameter color stabilization ability (CSK) that the is modified in aspect of the parameter of capability information element, wherein following semantic to the position 27-28 distribution of capability information field according to one embodiment of the present invention:
| Position 27-28 | The |
| 00 | Without color stabilization |
| 01 | When receiving the observability frame, color stabilization information sends to telegon from |
| 10 | When receiving the observability frame, color stabilization information sends to equipment from |
| 11 | When either party received the observability frame, color stabilization information sent to telegon and sends to equipment from telegon from equipment. |
At length, value " 00 " expression of position 27-28, it is possible not having color stabilization, value " 01 " expression, receiving that " observability frame " can send to telegon from network node with color stabilization information afterwards, value " 10 " expression, receiving that " observability frame " can send to network node and value " 11 " expression from telegon with color stabilization information afterwards, receiving that " observability frame " can not only send to telegon but also conversely from network node with color stabilization information afterwards, wherein said " observability frame " or receive by network node and/or by telegon.But to point out that importantly accurately position distribution is freely.For example coding " 11 " also can take implication " without color stabilization ".
Below, set forth the example definitions of new argument " response of CapabilityNegotiationResponse(capability negotiation) ".Affiliated " capability negotiation response field " has following structure:
| ? | The position | Function |
| … | … | … |
| The PHY layer ability of asking | 1-2 | The color stabilization scheme |
| … | … | … |
The field " color stabilization scheme " of revising according to one embodiment of the present invention has following semanteme:
| The position | The |
| 00 | Without color stabilization |
| 01 | When receiving the observability frame, color stabilization information sends to telegon from |
| 10 | When receiving the observability frame, color stabilization information sends to equipment from |
| 11 | When either party received the observability frame, color stabilization information sent to telegon and sends to equipment from telegon from equipment. |
If " capability negotiation response " comprise function, also be the function of color stabilization, two tables above then are identical.About in the cocommutative message of MAC layer, especially distribute reply 36 and other in the cocommutative message of MAC layer, carry out other modifications according to one embodiment of the present invention.Should exemplarily illustrate below the tabulation of " MAC command frame (MAC Command Frame) ":
By means of the MAC message of revising " color stabilization information (Color-stabilization information) ", present supporting signal intensity vector
The transmission of the corresponding value of the optical power that receives in corresponding optical radiation receiver place of form.The form of the modification shown in this message has below:
| Eight bit byte | 1 | 2 | 6 |
| The MHR field | The command frame identifier | The short address | Color stabilization information |
In order to set forth field, with reference to the standard 802.15.7 that still is in the formation.Be important to note that the size of color stabilization information also allows to transmit the whole signal vector that has more than enough resolution (16).
The signal strength signal intensity vector
Being transmitted in the field " color stabilization information " of analog value of the optical power that receives at corresponding optical radiation receiver place of form carried out.
Support now the definition of time interval after described time interval finishes, to promote new color stabilization by means of the MAC message of revising " color stabilization timer notice (Color-stabilization-timer notification) ".The form of the modification shown in this message has below:
| Eight bit byte | 1 | 2 | 2 |
| The MHR field | The command frame identifier | The short address | The color stabilization timer |
In order to explain this field, with reference to the standard 802.15.7 that still is in the formation.
Replenishing that time interval mentioned in standard is formed, the other times interval also is still possible.For example, the time between two stabilisation message can be calculated, as＜binary one〉x10^＜binary system 2 〉, wherein { color stabilization timer }={ binary one binary system 2}.
Alternative basis as 10 is possible equally.The standard value of timer is selected in recommendation from second or minute scope.The value of proof is near 10 seconds the scope in practice.
According to one embodiment of the present invention, also according to following exemplary expression PIB PIB(physical layer personal area network information bank (Physical-Layer Personal-Area-Network Information Base) is set) modification:
In addition, the alternative magnitude range that is used for timer also is possible, referring to top enforcement.
Another advantage according to expansion scheme of the present invention is, utilizes same adjustment can realize compensation relevant with direct current and the relevant quantum efficiency with alternating current in the associating stage.Because receiver only sends it back the signal that receives, so this receiver does not need to distinguish: whether these signals are measured at the place, end of long observability frame (as for the compensation relevant with direct current) or short observability frame (as for the compensation relevant with alternating current).
Therefore, the length of the transmitter length of measuring CSK frame by its with the observability frame that passes through to send is determined the flexibility of described or another pattern.Therefore be unnecessary in an advantageous manner such as other MAC signallings of needing in the formerly known method according to expansion scheme of the present invention.
Claims (10)
1. be used for when optical transmission data, coloud coding being carried out the method for stabilisation,
-wherein for the coloud coding method of the transmission of data setting between transmitter and receiver based on a plurality of basic colors,
-wherein corresponding basic colors sends and is received by at least one corresponding optical radiation receiver at receiver side by the optical radiation source of at least one corresponding sender side,
-wherein consisting of at least one calibration message by transmitter, described at least one calibration message comprises at least one time series, utilizes the value of the optical power that will send to adjust the optical radiation source that at least one distributes to basic colors in described time series,
-wherein send at least one calibration message by transmitter,
-wherein at least one calibration message of reception in receiver, and the analog value of the optical power that receives at corresponding optical radiation receiver place is determined and is sent to transmitter,
-the analog value that wherein makes the optical power that receives in corresponding optical radiation receiver place in transmitter produces relation with the analog value of the optical power that sends in corresponding place, optical radiation source,
-wherein determine compensated information based on this relation, wherein carry out the coupling that at least one sends parameter based on this compensated information.
2. method according to claim 1 is characterized in that, calibration message is constructed to the CVD frame.
3. according to the described method of one of aforementioned claim, it is characterized in that a plurality of calibration message in succession comprise respectively identical coding, it is corresponding to the summit in the planisphere.
4. method according to claim 3, it is characterized in that, determine the optical power in the reception of corresponding optical radiation receiver place, described optical power is received after having respectively one or more calibration message in succession of identical coding, and described calibration message preferably is constituted as so-called observability frame.
5. method according to claim 4 is characterized in that, determines, is formed in the mean value of the value of the optical power that corresponding optical radiation receiver place receives.
6. according to the described method of one of aforementioned claim, it is characterized in that wherein determining scale and the mode of the stabilisation of coloud coding in the telegon side for the integrated processes by telegon distribution network node.
7. method according to claim 6, integrated processes are characterised in that, arrange to distribute and reply (30), and network node utilizes described distribution to reply will to be used for the technical capability of the stabilisation of carrying out coloud coding send telegon to.
8. according to claim 6 to one of 7 described methods, it is characterized in that, message is set, utilize the definition in described message delivery time interval, after described time interval finishes, impel the again stabilisation of coloud coding.
9. be used between transmitter and receiver the optically optical transmission system of the transmission of data, it is set up under using based on the situation of the coloud coding method of a plurality of basic colors described data being encoded and transmitting, have be used to the optical radiation source of the corresponding sender side that sends corresponding basic colors and be used for receiving the optical radiation receiver of the corresponding receiver side of corresponding basic colors, it is characterized in that
Set analytic unit (CU) in receiver is used for determining the corresponding value of the optical power that receives in corresponding optical radiation receiver place;
Backward channel (BC) is used for transmitting by the determined corresponding value of analytic unit (CU);
The color stabilization module (CSM) that arranges in transmitter is used for determining at least one compensating factor based on the analog value of the optical power that receives in corresponding optical radiation receiver place and the relation between the analog value of the optical power of corresponding optical radiation source place's transmission;
The correcting element that arranges in transmitter is used for determining at least one compensated information and mate at least one based on described compensated information to send parameter based on described relation.
10. optical transmission system is used for one of the aforementioned claim 1 to 8 of executive basis described method.
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| PCT/EP2011/057961 WO2011144607A1 (en) | 2010-05-17 | 2011-05-17 | Method and arrangement for stabilizing a colour coding method for optical transmission of data |
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| CN102884737B CN102884737B (en) | 2016-10-05 |
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| ES2535207T3 (en) | 2015-05-06 |
| EP2534773B1 (en) | 2015-02-25 |
| KR101497414B1 (en) | 2015-03-02 |
| WO2011144607A1 (en) | 2011-11-24 |
| US20130064541A1 (en) | 2013-03-14 |
| CN102884737B (en) | 2016-10-05 |
| PL2534773T3 (en) | 2015-08-31 |
| EP2534773A1 (en) | 2012-12-19 |
| KR20130067489A (en) | 2013-06-25 |
| US9020338B2 (en) | 2015-04-28 |
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